from typing import Any

import flask
from flask.typing import RouteCallable
from flask.views import MethodView
from validataclass.validators import Validator


class BaseMethodView(MethodView):
    """
    Base class for REST API views.
    """

    @property
    def request(self) -> flask.Request:
        return flask.request

    @classmethod
    def as_view(cls, *args, **kwargs) -> RouteCallable:
        return super().as_view(cls.__name__, *args, **kwargs)

    @staticmethod
    def empty_response(code: int = 204) -> tuple[str, int]:
        return '', code

    def validate_request_data(self, validator: Validator) -> Any:
        """
        Parses request data as JSON and validates it using a validataclass validator.
        """
        # TODO error handling: wrong content type; empty body; invalid json; validation errors
        parsed_json = self.request.json
        return validator.validate(parsed_json)